The Samurai Rangers team up with the mysterious RPM Ranger Red to fight off dual threats from Master Xandred's Mooger army and a robotic supervillain from the RPM Ranger's dimension.

After Antonio develops an unusual fear of fish that leaves him unable to be the Gold Ranger, his teammates rally to help him overcome it. Meanwhile, a mysterious and powerful new enemy arrives to help Master Xandred in his quest to flood the earth.

Octoroo, with the help of the Nighlok Eyescar, kidnaps Antonio and Mentor to use as bait in order to lead the rest of the Rangers into a Mooger trap.

A daring boy named Cody unlocks an ancient seal, releasing an enormous BullZord, the very first Samurai Zord, which rampages across the countryside. The Power Rangers must fight to save the city by capturing the beast and taming it to serve as their newest Megazord.

When Mia's younger brother comes to town to try and convince her to sing lead in his band, the reunion is anything but sweet music. Meanwhile, Serrator once again attacks the city.

When a Nighlok eats his Samuraizer, Kevin is unable to help the team defeat the beast, at the same time that he is missing his old life as a competitive swimmer. Meanwhile, Dayu and Deker make a deal with the evil Serrator.

While the Rangers battle a crafty Nighlok who creates mirror images of himself to confuse them, Spike realizes that one of the duties of being a Samurai is to share in the responsibilities of day-to-day life and sets off to find a job so he can help pay the rent on his Uncle Bulk's clubhouse.

Emily has a crisis in confidence, just as the other Rangers are affected by a Nighlok's evil black sand, which sends them into a desperate hunger/thirst mode. While Emily and Mentor Ji struggle to manage the hungry Rangers and defeat the Nighlok, Bulk and Spike find Mia's wallet and head to the Shiba House to return it.

After a Nighlok glues their hands together, Kevin and Mike learn that working as a team doesn't just mean sharing their strengths; it's knowing when they need to ask for help with their weaknesses as well.

Serrator takes the first step in his mysterious master plan to seize the earth by clouding the minds of the people of the island Monalua, spreading paranoia throughout the residents. To stop Serrator, the Rangers will need a special new weapon, the Bullzooka!

As Jayden struggles with his sudden doubts on whether or not he has what it takes to be the Red Ranger, Master Xandred demands Serrator return Dayu's Harmonium, prompting Serrator to reveal his true intentions.

The Rangers discover that Serrator's recent attacks have an ulterior motive -- to crack open the earth and let the Sanzu flood it and thereby become ruler of both worlds.

When Serrator asks Deker to fulfill the final piece of his destructive plans, Antonio begs Deker to reconsider his role in the battle between humans and the Nighlok.